UPDATING comboBox of QTableWidget using SQLite3 Datbase???

Hi,
I used following code to update sqlite3 database for ComboBox which is a widget in QTableWidget but its not getting updated.
QString r (QString("UPDATE cockpit SET Status = '%1'").arg(lis.at(0)));
qDebug() << lis.at(0);
qr.prepare(r);
if( !qr.exec() )
qDebug() << qr.lastError();
else
qDebug( "Updated!" ); / here it executes and displays as Updated!

But when close GUI and and run for the next time the updated value is lost....it still shows the precious value....
i have used following lines to check the updated status column..
qry.prepare("SELECT Status FROM cockpit");
if( !qry.exec() )
qDebug() << qry.lastError();
else {
// QComboBox *combos;